I have two of these On Stage 2nd Tiers. They are certainly rugged enough to hold even large keyboards. The only thing I don't like is that the height is set at approx 7.5 in between keyboards(depending on the height of the bottom one). The tilting arms are on ratchets(very secure),but run only about $30 and are universal.
pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact